Strength of Materials - Mechanical Engineering Questions - Set 15

Practice Test: Question Set - 15

1. The maximum strain energy that can be
stored in a body is known as

(A) Impact energy

(B) Resilience

(C) Proof resilience

(D) Modulus of resilience

Answer: Option C

2. Two
closely-coiled helical springs 'A' and 'B' of the same material,
same number of turns and made from same wire are subjected to an axial load W.
The mean diameter of spring 'A' is double the mean diameter of spring 'B'.
The ratio of deflections in spring 'B' to spring 'A' will be

(A) 1/8

(B) 1/4

(C) 2

(D) 4

Answer: Option A

3. The force acting along the circumference
will cause stress in the walls in a direction normal to the longitudinal axis
of cylinder; This stress is called

(A) Longitudinal stress

(B) Hoop stress

(C) Yield stress

(D) Ultimate stress

Answer: Option B

4. The section
modulus of a rectangular section about an axis through its C.G., is

(A) b/2

(B) d/2

(C) bd²/2

(D) bd²/6

Answer: Option D

5. The change
in length due to a tensile or compressive force acting on a body is given by
(where P = Tensile or compressive force acting on the body, l =
Original length of the body, A = Cross-sectional area of the body, and E
= Young's modulus for the material of the body)

(A) PlA/E

(B) Pl/AE

(C) E/PlA

(D) AE/Pl

Answer: Option B

6. In riveted boiler joints, all stresses,
shearing, bearing and tensile are based on the

(A) Size of rivet

(B) Size of the drilled or reamed hole

(C) Average of size of rivet and hole

(D) Smaller of the two

Answer: Option B

7. In
calculating the strength of a riveted joint in tearing, shearing and crushing,
the

(A) Actual
diameter of rivet is used

(B) Actual
diameter of hole drilled for rivet is used

(C) Mean
diameter of hole drilled and rivet is used

(D) Smaller
of the rivet diameter and hole diameter is used

Answer: Option B

8. It equal and opposite forces applied to a
body tend to elongate it, the stress so produced is called

(A) Internal resistance

(B) Tensile stress

(C) Transverse stress

(D) Compressive stress

Answer: Option B

9. The hoop
stress in a riveted cylindrical shell of diameter (d), thickness (t)
and subjected to an internal pressure (p) is (where η = Efficiency of
the riveted joint)

(A) pd/η × t

(B) pd/η × 2t

(C) pd/η × 4t

(D) pd/η × 8t

Answer: Option B

10. A non yielding support implies that the

(A) Support is frictionless

(B) Support can take any amount of reaction

(C) Support holds member firmly

(D) Slope of the beam at the support is zero

Answer: Option D

11. Which of the
following is the correct torsion equation?

(A) M/I = σ/y = E/R

(B) T/J = τ/R = Cθ/l

(C) M/R = T/J = Cθ/l

(D) T/l= τ/J = R/Cθ

Answer: Option B

12. For steel, the ultimate strength in shear
as compared to in tension is nearly

(A) Same

(B) Half

(C) One third

(D) Two third

Answer: Option B

13. The given
figure shows the Mohr's circle of stress for two unequal and like principal stresses
(σxand σy) acting at a body across two mutually
perpendicular planes. The resultant stress is given by